A harmless fish resembling a venomous one shows:
A harmless fish that resembles a venomous fish gains protection without producing the costly defense itself, which is the defining asymmetry of Batesian mimicry. Predators that have been injured by, or have learned to avoid, the venomous model generalize its recognizable shape, coloration, or behavior to the edible mimic. The mimic benefits because mistaken identity lowers attack probability, while excessive mimic abundance can disadvantage the model by making its warning signal less reliable. This contrasts with Müllerian mimicry, where both resembling species are defended and share the cost
Ref: Evolutionary Analysis, Herron & Freeman, 5th Ed., Ch. 10
